Families in Ukrainian cities are taking refuge from massive swarms of Russian drones, as Moscow steps up its airborne assault with attacks designed to undermine Ukrainian morale.

In recent weeks, Russia has significantly intensified its air attacks on Ukraine, launching up to 479 drones and missiles in a single night. The scale and new tactics complicate Ukraine’s defense efforts,

Drones are “ubiquitous, because they are quite useful, and they're demonstrating that every day in Ukraine,” one analyst told NBC News.